US20080309158A1 - Transmission System for Interchanging Information Data Between an Electrical Load and an Upstream Converter - Google Patents

Transmission System for Interchanging Information Data Between an Electrical Load and an Upstream Converter Download PDF

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Publication number
US20080309158A1
US20080309158A1 US12/158,882 US15888206A US2008309158A1 US 20080309158 A1 US20080309158 A1 US 20080309158A1 US 15888206 A US15888206 A US 15888206A US 2008309158 A1 US2008309158 A1 US 2008309158A1
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transmission system
inductive component
converter
inductive
receiver
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US12/158,882
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US7825533B2 (en
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Hubert Schierling
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Siemens AG
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Siemens AG
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHIERLING, HUBERT, DR.
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5483—Systems for power line communications using coupling circuits

Definitions

  • the invention relates to a transmission arrangement for interchanging information data between an electrical load, adjacent to which a transmitter is located, and a converter, adjacent to which a receiver is located, via a supply cable which is connected to a sine-wave filter, comprising series inductors and filter capacitors.
  • the loads may be electrical drive machines, or else other three-phase or single-phase loads, such as solenoid valves, switches, etc.
  • Means are therefore used to interchange information data between an electrical load and an equipment which is arranged between the load and the electrical supply network and is used for automatic identification of load data, for example rating plate data relating to an electrical drive machine.
  • the load contains a load identification unit which has at least one such digital rating plate, which is stored in an electronically legible memory means.
  • the load identification unit is coupled via coupling impedances to the supply lines between the load and the converter, by means of which the data from a transmitter in the load identification unit is modulated, after initialization by the converter by means of a carrier frequency that is higher than the mains frequency, onto the voltage on the supply lines, that is to say onto two phase conductors of the supply cable.
  • DE 197 30 492 A1 describes the storage of information relating to the drive machine, such as type information or commissioning information, in a memory unit arranged in the drive machine. This offers the advantage that information relating to the drive machine is available in a form which can be automated by reading the memory unit.
  • DE 102 43 563 A1 has proposed that information be transmitted from a drive machine to a controller (converter) or the like via a supply line which is used for the electrical power supply. There is advantageously therefore no need for an additional data line.
  • the data transmission is initialized by the upstream controller, likewise via the power supply lines, in particular with a zero-voltage state of the supply lines being used for data transmission.
  • An electrical coil or a capacitive coupling between the cable cores is used as a coupling unit.
  • a similar measure is known from DE 199 11 217 A1, according to which the information from a converter is modulated at a higher frequency onto a supply line, and is transmitted to at least one further converter, central computer or similar appliance.
  • Constant-voltage frequency converters are used in particular for supplying electrical power at a controlled voltage and frequency to three-phase machines. They operate with a DC voltage intermediate circuit and a controlled inverter, which is equipped with power semiconductor switches. Power FETs or IGBTs are used as power semiconductor switches, and allow very high-speed switching. Although this has the advantage of very low switching losses, it also results in problems for the insulation materials because of the high dU/dt load on the connected cables between the inverters and the three-phase machine, and may even lead to electromagnetic interference with adjacent signal cables and devices.
  • a sine-wave filter comprises a three-phase series inductor and a capacitance network between an inverter and a three-phase machine.
  • the filter produces a sinusoidal voltage between the three conductors, but effectively also acts as a short circuit for data transmission between a three-phase machine and a converter, so that data can no longer be received at the converter.
  • the invention is based on the object of specifying a transmission arrangement for the information interchange described initially, which is simple and allows stable data traffic.
  • an inductive component is inserted at least into the circuit which is formed by the transmitter, one phase conductor of the supply cable and the receiver, the core of which inductive component enters saturation at a current which is considerably less than the rated current of the load.
  • FIG. 1 shows the principle of a transmission arrangement between a motor and an upstream converter
  • FIG. 2 shows the arrangement of a sine-wave filter on the motor cable
  • FIG. 3 shows the insertion of inductive components in the transmitter-receiver circuit according to the invention
  • FIG. 4 shows a second variant of the invention
  • FIG. 5 shows a third variant of the invention
  • FIG. 6 shows a fourth variant of the invention
  • FIG. 7 shows the inductive component in the form of a transformer.
  • FIG. 1 shows a data transmission path between a motor 1 with a transmitter 2 and a converter 3 with a receiver 4 via a motor cable 5 .
  • the transmitter 2 adjacent to the motor 1 feeds signals into the motor cable 5 , and these are evaluated in the receiver 4 .
  • the transmission frequency is about 30 kHz.
  • the received signals are at a very low level (mV range).
  • the filter capacitor 8 short-circuits the cable cores to which the transmitter 2 and receiver 4 are connected ( FIG. 2 ). It is then impossible to evaluate the signals.
  • inductive components 9 are introduced into at least two of the three capacitor branches ( FIG. 3 ), then the voltage drop across these inductive components 9 can be measured.
  • the impedances of the inductive components 9 would, however, cause interference because they would cancel out, or at least greatly adversely affect, the filter effect. This effect does not occur by using inductive components 9 which enter saturation even at very low current levels.
  • Inductances such as these are provided, for example, by means of coils with a ferrite core.
  • the ferrite core may be in the form of an annular core through which one conductor is threaded at least once. Because of the high permeability of the ferrite core, it enters saturation even at a very low current level. When the converter 1 is blocked, the current is in contrast virtually zero, and the inductance of the inductive component 9 is fully effective.
  • FIGS. 3 to 6 show embodiments for the transmission arrangement.
  • an inductive component 9 is connected in series with each of the filter capacitors 8 , which are connected to the phase conductor to which the receiver 4 is also connected.
  • inductive components 9 are likewise connected in series with the two filter capacitors 8 .
  • the input voltage to the receiver 4 is tapped off directly from the inductive component 9 which is located in the circuit comprising the transmitter 2 , the first phase conductor of the motor cable 5 , the filter capacitor 8 , and the second phase conductor of the motor cable 5 .
  • the two affected filter capacitors 8 are connected together, and are connected to the common second phase conductor via an inductive component 9 .
  • FIG. 6 shows a variant in which the inductive component 9 is connected directly into one phase of the motor cable 5 .
  • FIGS. 5 and 6 require only a single inductive component 9 .
  • the load current flows directly through the inductive component 9 .
  • the filter capacitor 8 causes virtually no adverse effect during normal operation.
  • an annular core with a secondary winding is added to a transformer 10 and this is connected to the receiver 4 , then this also results in a floating signal ( FIG. 7 ).
  • the signal voltage can be increased by the number of turns.
  • a short-circuiting device, which is not shown here, in the receiver 4 can be used to short-circuit the secondary side during normal operation. This reduces the impedance of the transformer 10 . Brief voltage spikes which may possibly otherwise occur during normal operation are prevented.
  • the switching power of the short-circuiting device is very low, since the transformer 10 can transmit only a low power level.

Abstract

A transmission system for exchanging information data between an electric load having an emitter and a converter having a receiver is disclosed. The converter and the load are connected by a multi-phase supply cable which is connected to a sinus filter having in-line coils and filter capacitors connected across the phases. An inductive component is integrated in the electric circuit formed by the transmitter, a phase conductor of the supply cable and the receiver, wherein the core of the inductive component already saturates even if the current is significantly less than a rated current of the electric load. This transmission system for information data exchange is easy to implement and enables stable data transfer.

Description

  • The invention relates to a transmission arrangement for interchanging information data between an electrical load, adjacent to which a transmitter is located, and a converter, adjacent to which a receiver is located, via a supply cable which is connected to a sine-wave filter, comprising series inductors and filter capacitors. In particular, the loads may be electrical drive machines, or else other three-phase or single-phase loads, such as solenoid valves, switches, etc.
  • For a converter, it may be highly important to know data relating to the downstream loads. Means are therefore used to interchange information data between an electrical load and an equipment which is arranged between the load and the electrical supply network and is used for automatic identification of load data, for example rating plate data relating to an electrical drive machine.
  • The load contains a load identification unit which has at least one such digital rating plate, which is stored in an electronically legible memory means. The load identification unit is coupled via coupling impedances to the supply lines between the load and the converter, by means of which the data from a transmitter in the load identification unit is modulated, after initialization by the converter by means of a carrier frequency that is higher than the mains frequency, onto the voltage on the supply lines, that is to say onto two phase conductors of the supply cable.
  • By way of example, DE 197 30 492 A1 describes the storage of information relating to the drive machine, such as type information or commissioning information, in a memory unit arranged in the drive machine. This offers the advantage that information relating to the drive machine is available in a form which can be automated by reading the memory unit.
  • DE 102 43 563 A1 has proposed that information be transmitted from a drive machine to a controller (converter) or the like via a supply line which is used for the electrical power supply. There is advantageously therefore no need for an additional data line. The data transmission is initialized by the upstream controller, likewise via the power supply lines, in particular with a zero-voltage state of the supply lines being used for data transmission. An electrical coil or a capacitive coupling between the cable cores is used as a coupling unit.
  • A similar measure is known from DE 199 11 217 A1, according to which the information from a converter is modulated at a higher frequency onto a supply line, and is transmitted to at least one further converter, central computer or similar appliance.
  • The arrangements operate with a constant-voltage frequency converter. Constant-voltage frequency converters are used in particular for supplying electrical power at a controlled voltage and frequency to three-phase machines. They operate with a DC voltage intermediate circuit and a controlled inverter, which is equipped with power semiconductor switches. Power FETs or IGBTs are used as power semiconductor switches, and allow very high-speed switching. Although this has the advantage of very low switching losses, it also results in problems for the insulation materials because of the high dU/dt load on the connected cables between the inverters and the three-phase machine, and may even lead to electromagnetic interference with adjacent signal cables and devices.
  • It is therefore known for so-called sine-wave filters to be used to cope with these problems. In the simplest embodiment, a sine-wave filter comprises a three-phase series inductor and a capacitance network between an inverter and a three-phase machine. The filter produces a sinusoidal voltage between the three conductors, but effectively also acts as a short circuit for data transmission between a three-phase machine and a converter, so that data can no longer be received at the converter.
  • Possible ways to cope with this problem will be:
      • disconnection of the capacitor on startup, by means of a switch,
      • provision of a damping resistance and evaluation of the voltage across this damping resistance, or
      • measurement of the current in the motor line or in the capacitor branch.
  • In the first-mentioned case, not only must an additional switch be provided, but also appropriate control electronics for the switch. In the two last-mentioned alternatives, the measurement signals are so small that it is virtually impossible to evaluate them.
  • The invention is based on the object of specifying a transmission arrangement for the information interchange described initially, which is simple and allows stable data traffic.
  • According to the invention, the object is achieved by the features of claim 1. Expedient refinements are the subject matter of the dependent claims.
  • Accordingly, an inductive component is inserted at least into the circuit which is formed by the transmitter, one phase conductor of the supply cable and the receiver, the core of which inductive component enters saturation at a current which is considerably less than the rated current of the load.
  • The transmission arrangement according to the invention
      • allows data reception even with filtered drives,
      • does not adversely affect the filter effect,
      • results in the magnitude of the received signal being independent of the filter impedances, that is to say independent of the appliance power, and
      • limits the voltage across the measurement device during normal operation.
  • The invention will be explained in more detail in the following text with reference to a plurality of exemplary embodiments. In the associated drawings:
  • FIG. 1 shows the principle of a transmission arrangement between a motor and an upstream converter,
  • FIG. 2 shows the arrangement of a sine-wave filter on the motor cable,
  • FIG. 3 shows the insertion of inductive components in the transmitter-receiver circuit according to the invention,
  • FIG. 4 shows a second variant of the invention,
  • FIG. 5 shows a third variant of the invention,
  • FIG. 6 shows a fourth variant of the invention, and
  • FIG. 7 shows the inductive component in the form of a transformer.
    •
  • FIG. 1 shows a data transmission path between a motor 1 with a transmitter 2 and a converter 3 with a receiver 4 via a motor cable 5. When the converter 3 is blocked, the transmitter 2 adjacent to the motor 1 feeds signals into the motor cable 5, and these are evaluated in the receiver 4. The transmission frequency is about 30 kHz. The received signals are at a very low level (mV range).
  • If the converter 3 is equipped with a sine-wave output filter 6, comprising series inductances 7 and a capacitance network composed of filter capacitors 8, then the filter capacitor 8 short-circuits the cable cores to which the transmitter 2 and receiver 4 are connected (FIG. 2). It is then impossible to evaluate the signals.
  • If inductive components 9 are introduced into at least two of the three capacitor branches (FIG. 3), then the voltage drop across these inductive components 9 can be measured. During normal operation, the impedances of the inductive components 9 would, however, cause interference because they would cancel out, or at least greatly adversely affect, the filter effect. This effect does not occur by using inductive components 9 which enter saturation even at very low current levels. Inductances such as these are provided, for example, by means of coils with a ferrite core. For example, the ferrite core may be in the form of an annular core through which one conductor is threaded at least once. Because of the high permeability of the ferrite core, it enters saturation even at a very low current level. When the converter 1 is blocked, the current is in contrast virtually zero, and the inductance of the inductive component 9 is fully effective.
  • FIGS. 3 to 6 show embodiments for the transmission arrangement.
  • In the variant shown in FIG. 3, an inductive component 9 is connected in series with each of the filter capacitors 8, which are connected to the phase conductor to which the receiver 4 is also connected.
  • In the variant shown in FIG. 4, inductive components 9 are likewise connected in series with the two filter capacitors 8. However, the input voltage to the receiver 4 is tapped off directly from the inductive component 9 which is located in the circuit comprising the transmitter 2, the first phase conductor of the motor cable 5, the filter capacitor 8, and the second phase conductor of the motor cable 5.
  • According to the variant shown in FIG. 5, the two affected filter capacitors 8 are connected together, and are connected to the common second phase conductor via an inductive component 9.
  • FIG. 6 shows a variant in which the inductive component 9 is connected directly into one phase of the motor cable 5.
  • In the variants shown in FIGS. 4 to 6, only low voltages occur on the measurement device even during normal operation. There is therefore no need to disconnect the transmitting and receiving device by means of a relay.
  • The variants shown in FIGS. 5 and 6 require only a single inductive component 9. According to the variant in FIG. 6, the load current flows directly through the inductive component 9. The filter capacitor 8 causes virtually no adverse effect during normal operation.
  • If an annular core with a secondary winding is added to a transformer 10 and this is connected to the receiver 4, then this also results in a floating signal (FIG. 7). The signal voltage can be increased by the number of turns. A short-circuiting device, which is not shown here, in the receiver 4 can be used to short-circuit the secondary side during normal operation. This reduces the impedance of the transformer 10. Brief voltage spikes which may possibly otherwise occur during normal operation are prevented. The switching power of the short-circuiting device is very low, since the transformer 10 can transmit only a low power level.

Claims (12)

1.-10. (canceled)
11. A transmission system for exchanging information data between an electrical load and a converter, comprising:
a transmitter located in or on the electric load,
a receiver located in or on the converter,
a supply cable having phase conductors connected between the electric load and the converter, with the supply cable connected to a sine-wave filter which comprises filter capacitors connected between the phase conductors and series inductors, and
at least one inductive component connected to at least one of the phase conductors of the supply cable, wherein a core of the at least one inductive component enters saturation at a current which is significantly less than a rated current of the electric load.
12. The transmission system as claimed in claim 11, comprising two inductive components, wherein one terminal of each of the inductive components is connected in series with a corresponding one of the filter capacitors and another terminal of each of the inductive components is connected with the phase conductor that is also connected to the receiver.
13. The transmission system as claimed in claim 11, wherein the receiver receives an input voltage corresponding to a voltage across one of the at least one inductive components.
14. The transmission system as claimed in claim 12, wherein the receiver receives an input voltage corresponding to a voltage across one of the at least one inductive components.
15. The transmission system as claimed in claim 11, wherein the inductive component is a coil.
16. The transmission system as claimed in claim 11, wherein the inductive component is a transformer.
17. The transmission system as claimed in claim 11, wherein the core of the inductive component is a ferrite core.
18. The transmission system as claimed in claim 11, wherein the core of the inductive component is in form of an annular core.
19. The transmission system as claimed in claim 11, wherein one terminal of the at least one inductive component is connected in series with a corresponding filter capacitor and another terminal of the at least one inductive component is connected with the phase conductor that is also connected to the transmitter.
20. The transmission system as claimed in claim 19, wherein a second filter capacitor is connected between a third phase conductor and a junction point between the at least one inductive component and the corresponding filter capacitor.
21. The transmission system as claimed in claim 11, wherein the at least one inductive component is serially connected in one of the phase conductors.
US12/158,882 2005-12-22 2006-11-10 Transmission system for interchanging information data between an electrical load and an upstream converter Expired - Fee Related US7825533B2 (en)

Applications Claiming Priority (4)

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DE102005061568A DE102005061568B4 (en) 2005-12-22 2005-12-22 Transmission arrangement for the exchange of information data between an electrical load and a upstream converter
DE102005061568 2005-12-22
DE102005061568.6 2005-12-22
PCT/EP2006/068324 WO2007073978A1 (en) 2005-12-22 2006-11-10 Transmitting arrangement for exchanging information data between an electric consumer and an upstream converter

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US7825533B2 US7825533B2 (en) 2010-11-02

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JP2014175744A (en) * 2013-03-07 2014-09-22 International Business Maschines Corporation Transmitting device, receiving device, circuit device, communication method and program
US9509234B2 (en) 2013-06-17 2016-11-29 Siemens Aktiengesellschaft Method for operating a drive control device, facility with means for executing the method and drive control device with such a facility
WO2019075703A1 (en) * 2017-10-19 2019-04-25 全球能源互联网研究院有限公司 Mixed power flow control device

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EP2568560B1 (en) 2011-09-07 2014-12-31 Siemens Aktiengesellschaft Frequency inverter and method for detecting and blocking a residual current in a frequency inverter
EP2680421B2 (en) 2012-06-29 2018-08-08 Siemens Aktiengesellschaft Frequency inverter with intermediate circuits and method for preloading same
EP3068024B1 (en) 2015-03-09 2018-01-31 Siemens Aktiengesellschaft Method for controlling a vienna rectifier
EP3217522A1 (en) 2016-03-08 2017-09-13 Siemens Aktiengesellschaft Bidirectional rectifier device
DE102018000509A1 (en) 2017-02-02 2018-08-02 Sew-Eurodrive Gmbh & Co Kg Hybrid cable with integrated fiber optic cable

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JP2014175744A (en) * 2013-03-07 2014-09-22 International Business Maschines Corporation Transmitting device, receiving device, circuit device, communication method and program
US20140294051A1 (en) * 2013-03-07 2014-10-02 International Business Machines Corporation Transmitting Device, Receiving Device, Circuit Device, Communication Method and Program
US9054914B2 (en) * 2013-03-07 2015-06-09 International Business Machines Corporation Transmitting device, receiving device, circuit device, communication method and program
US9509234B2 (en) 2013-06-17 2016-11-29 Siemens Aktiengesellschaft Method for operating a drive control device, facility with means for executing the method and drive control device with such a facility
WO2019075703A1 (en) * 2017-10-19 2019-04-25 全球能源互联网研究院有限公司 Mixed power flow control device

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EP1964277A1 (en) 2008-09-03
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US7825533B2 (en) 2010-11-02
DE102005061568A1 (en) 2007-07-05

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